Purifier-box.



PATE'NTED FEB. 4, 1908.

H. L. DOHERTY.

PURIPLFJR BOX. APPLICATION FILED NOV. 12, 1906.

3 SHEETS-SHEET 1.

M M M w W L.

BY X

PATENTED FEB. 4. 1908.

HENRY L.'DOHERTY, OF MADISON, WISCONSIN.

PURIFIER-BOX.

Specification of Letters Patent.

Patented Feb 4, 1908.

Application filed November 12. 1906. Serial No. 343055.

approximate uniformity through amass of )ulverulent or granular material, and is emodied specifically 111 a purifying box or vessel for treating gases with pulverulentor granular reagents, said box being adapted, by reason of my. invention being applied. thereto, to produce a maximum contact of gas and purifying material without clogging of gas conduits and with substantial uniformity of contact throughout the .mass of such material; all as more fully hereinafter set forth and claimed.

Many reagents used for purifying gases are loose powders, such, for instance, as the iron oxid employed for removing sulfur from lighting gas. and it is a technically difficult problem to direct gases evenly and uniformly through a mass of such powder. 'IYhether the gas be fed through from above, below or at one side, there are always orifices int-o which the powder can tumble and which it can clog, while if the endeavor be made to use a single well protected orifice in side or bottom, there 'is not the desirable even dis tribution of gas through the mass of the powder. If, as is frequently the case, even distribution and absence of cloggiii'g be sought by employing fabrics or gauze, of too fine a mesh for the entrance of powder, undue friction and slowness of passage of the gas are inevitable results. \Yith the usual iron oxid, or iron salts, used for the stated purpose, it is customary for this reason to Y employ more or less sawdust, mixed with the purifying material, thus giving the mass a sort of fiber and enabling it to arch over inferior orifices. But this is not very satisfactory. and moreover the sawdust is not desirable as a component of such mixtures in many cases.

In. the present invention, the desired object is secured by a simple, cheap and inexpensive structure, giving a maximum thoroughness ofcontact:between gas and reagent without danger of clogging, or of localized distribution of gas currents through the mass of material.

I will now proceed to describe my inven tion with reference to the accompanying drawings, which illustrate a gas purifying box embodying the said invention.

In the said drawings: Figure 1 shows a vertical longitudinal section through such a purifying box; Fig. 2 shows a top view of the box, empty, with the cover removed; and Fig. 3 shows an isometric perspective of the two bottoms; Fig. 4 is a detail fragmentary view of two ('f-ontinuous bottom plates, 20 and 21, shown broken away and also shown provided with staggered sets of orifices.

The essential. feature of my invention is, the introduction of the gas into the pulverulent or granular material through a series of holes or open spaces in a perforated plate or equivalent form of a false bottom, said holes or open spaces being so spaced and distributed asto give the desired distribution, and in guarding these holes against entry of the pulverulent or granular material thereto, by

, a series of guards located between said holes and the main body of. tliem'aterial, and so spaced and of such width, that pulverulent material falling or passing therearound and assuming, as it will, an angle of repose upon. such false bottom corresponding to the existing conditions, will not reach any of such holes.

In embodying this invention in a gas purifier, a closed purifier box of any desired shape, structure or material is provided with gas outlets and inlets adapted to direct a current of gas through it either from above downwards or from. below upwards, the latter being generally deemed preferable. Near its base it is provided with two false bottoms, theupper being a series of slats or a diaphragm perforated with tolerably large holes, the said slats or the material between said holes, forming the guards orshields above mentioned. Below this is the second false bottom, a diaphragm or partition extending horizontally across the vessel and provided with smaller openingscoming directly under the slats or under the imperforate portion of the upper false bottom, Orifice dimensions and partition distances are so arranged that material passing through the-slots between the slats of the upper diaphragmand lying on the lower in an angle-.of-repose position does not extend quite to the perforations or openings in the lower. Assuming that the material tends to bank up at an angle of about 45 and that aslatted upper partition is used, thetwo partitions should siderably nearer each other than one-half the be conof the box is a false bottom 8, provided with perforations or openings 9, and above this again is another false bottom formed by a series of slats 10. Each perforation is located beneath the middle of the slat next above, and the slats are such a distance above the lowermost false bottom (8) that the pulverulent material falling between them and banking up in the angle-of-re pose hillocks ll underneath the slats cannot q-uite reach the perforations or openings. In this manner of operation, itis obvious that wide areas of the pulverulent material are exposed to the flow ofthe incoming gas, the total surface area of the hillocks in a box of the type shown being very great and all avail- Advantageously,

able for gas penetration. the total cross-area of the perforations or openings 9 is made about the same as that of the gas inlet 4, or somewhat larger, the excess in size, however, being no more than will compensate for thQfI'lGtlOIl in such perforations. 7 distribute itself evenly through all theperforations, not tending to take a preferential flow through any.

Using a purifier box .of the character described with pulverulent materials, the usual admixture of sawdustwith such materials may be much reduced or done away with, with a saving of valuable purifier room and avoidance of the detrimental infiuence'of the sawdust in revivification and elsewhere.

What I claim is 1- l A purifier box for holding pulverulent purifying material having a substantially By so doing, the flow of gas will bottom while forming substantial hillocks' thereon shall not reach the openings of said ports.

I 3. A purifier box for holding pulverulent purifying material provided with a falsebottom having relatively small openings therein and a second false bottom having relatively large openings therein, located above the first bottom, the two sets of openin s being relatively staggered and the distance ietween the two bottoms and the diametersfof the openings of the two sets being so adjusted that pulverulent material falling through the up er, large openings while forming substantial hillocks on the lower bottom shall have an angle of repose. thereon preventing its reaching'the margins of the lower, narrower openings.

4. A urifier box for holding pulverulent materia provided with an outlet for gas drawing from the upper portion of the box, a gas inlet communicating with the lower portion, a material-supporting false bottom above the inlet provided with relatively wide openings, and a second false bottom between the first and the inlet provided with relatively narrow openings sta gered with respect to the first openings, sai false-bottoms being relatively so spaced apart as to cause the second openings to be beyond the angle of repose assumed by material freely falling through the first openings while allowing sub stantial hillocks of such material to form on the said second bottom.

5. A purifier box for holding pulverulent purifying material provided with gas outlets and inlets and also provided with a double false bottom, one such bottom consisting of a series of slats and the other of an orificed partition located below'the slat bottom, said slats being wider than the orificesof the partition and located above the same, the width of the several slats and the vertical distance apart ofthe two bottoms being so related that ulverulent material falling between the s ats shall form substantial hilloeks on the orificed partition in assuming an angle of repose thereon without reaching the margins of the orifices.

6. A purifier box for holding pulverulent material provided with gas outlets and inlets and also provided with a double false bottom, the upper bottom having relatively wide openings and the lower relatively narrow openings, said' latter. openings being set be yond the angle of repose of material falling through the former openings.

7-. A purifier boxfor holding pulverulent erai material provided with gas outlets and inlets and also provided with a double false bottom, the upper bottom having relatively wide perforatlons and the lower relatively narrow perforations, said latter openings bein set eyond the angle of repose of material falling through the former openings and beingso proportioned as to have a total sectional area equivalent to that of the gas outlets and inlets.

8. A urifier box for holding pulverulent materia provided with gas outlets and inlets and also provided with a double false bottom, the upper consisting of a series of slats and the lower of a perforated partition having its erforations set midway the width of the s ats above, the spaces'between the slats and the distances between the bottoms being so relatively related that material falling betweenthe slats may accumulate on the perforated partition in substantial hjllocks without reachin the perforations.

9. A urifier OX for holding pulverulent materia provided with gas outlets and inlets and also provided with a doublefalse bottom, the upper consisting of a series of slats and the lower of a perforated partition having its perforations set midway the width of the slat above, the two bottoms being spaced apart less than half the width of a slat but sufiiciently far apart to permit the formation of substantial hillocks of material on the perforated partition.

- In testimony whereof I aflix my signature, in the presence of two Witnesses.

HENRY L. DOHERTY.

Vitnsses;

ROGER H. LYON, K. P. MoELnoY. 

